Automatic sizing device



Oct. 29, 1935. H. E. BALslGER AUTOMATIC SIZING DEVICE 3 Sheets-Sheet l Filed April 5, 1952 Oct 29, 1935- H. E. BALSIGER AUTOMATIC SIZING DEVICE Filed April 5, 1952 3 Sheets-Sheet 2 .M 14,4 7 0f 4 4. wm @d V. A O 7 J/ .t Jv? m a Z J E. 44 wEE14 m 4 4N. 5 7 m4 4 4 4 4 rH//// .dwl I N 9 44 f .Irl l fr, ,4 H/ v 1A., l L 41 V w 44A I 4 m4 444444 ,a M Ufff/H 5 X Oct. 29, 1935. H, E, BALSIGER 2,019,066

AUTOMATIC SIZING DEVICE Filed April 5. 1932 3 Sheets-Sheet 3 INVENTOR BY/maca@ lATT NEY splines, holes or Patented Oct. 29, 1935 UNITED STATES PATENT OFFICE Landis Tool Company,

Waynesboro, Pa., a corporation ot Pennsylvania Application April 5, 1932, Serial No. 603,236

27 Claims.

This invention relates to automatic sizing devices and its object is to provide a device which will be highly sensitive to small changes in the size of the work being gaged and a further object is to improve generally devices of this character for measuring variations in the size of the work and for controlling mechanism for changing the size oi' the work.

Another object is to provide a device of such a character so t t work pieces having keyways, depressions or projections can be eilectively measured and sized while the work is revolving and also while work is being done on the work piece.

Another object is to provide a device whereby the measuring and sizing of the work is done without contact between the work and the measuring device.

Another object is to provide a device rigidly mounted to a base and unaiected by the pressure set up by the tool on the work and being of such a character that springing oi.' the work by the'tool will not affect sizing of the piece.

Another object is to provide a device of such a character that the piece being sized can be shiitedtoward or away from one of the recording members and the size measurement will be constant during said shifting of the piece.

Referring to the accompanying drawings, which are made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a. side elevation of a portion oi' the device,

Figure 2, a section on line and on an enlarged scale,

Figure 3, a section of the nozzle taken on line 3 3 of Figure 1,

Figure 4, a section oi' on line 4 4 o1' Figure 1,

Figure 5, a section of a manometer tube forming a part o1 the invention.

Figure 6, an enlarged detail of the modified form shown in Figure 8,

Figure 7, a side elevation of the complete device mounted .on the bed oi' a grinding machine or other machine for varying the diameter of work,

Figure 8, a detail of a modified form of a part of the device, and

Figure 9, a detail section on in Figure 5.

Numeral I Il indicates the support for the device which may be secured by bolts I2 to some element I|, lwhich in some instances may be the work carriage of a grinding machine or other machine used in reducing the size of work. A

2 2 of Figure 1 a cut-oil valve taken the dotted line 9 9 the iiuid iiowing through plugs 31 and 38. A

guide I3 may be slidably mounted in a bore in the support I0 and held in adjustable position by means of a screw |4. 'Ihe support i0 may have an arm or standard 5 through which a portion of the guide I3 is slidably mounted in 5 order to support the guide in rigid position. The guide may be axially movable by means of a knurled end I 6. The forward end of the guide I3 carries a block |1 secured thereon by vmeans of screws I8. The block |1 supports pipes or nozzles 10 I9 carried on blocks 25 which are secured to studs or pins 20. The blocks are adjusted toward and from the block I1 by means of screws 2| and locked in adjusted position by a screw 22 so that the nozzles will be held in a. fixed predetermined 15 position relative to the work during the grinding operation. The pipes I9 have radial-passages 23 through which iiuid under pressure may issue. Nozzle portions 24 having a bore registering with bore 23 are preferably secured to pipes I9. The 20 outer surface of the element 24 is preferably rounded or spherical in order to give a better effect to the jet.. The rounded outer surface or the nozzle 23 provides a stream line for air currents entrained by the escaping uid, so that these currents serve to maintain the iiuid Jet in compact shape for a greater distance from the outlet of the nozzle than would be true if a flat nozzle were used. 'I'he rear ends of the pipes I9 are connected to fluid conduits 21. 'I'he other ends of these conduits 21 are connected to nipples 28 and 29 which nipples in turn are secured in bores in a block 30. The block 30 is provided with chambers 3| and 32 to the latter oi' which chambers is connected a. pressure iiuid conduit 33 for supplying iiuid under pressure thereto. Pressure iiuid is supplied to the conduit 33 from a pressure iluid line 34. Suitable pressure reducing valves 35 and 36 are provided in line 34 in'order to reduce the pressure and to maintain a constant pressure in the line 33. Plugs 31 and 39 having restricted openings therethrough are provided between the chambers 3| and 32. The bores of these plugs are in alignment with the nipples 28 and'29. 'I'he bores in the plugsthere- 45 fore have a Venturi effect. 'I'he pressure in the chamber 3| will be affected by thevelocity of pipe 39 is connected to chamber-32 and a similar pipe 40 is connected to chamber 3|. Flexible or other 50 fluid conduit 4| connects pipe 39 with the upper end of a leg 43 ot a manometer tube and conduit 42 connects pipe 40 with 'a chamber in a block 44. 'Ihe upper end of; the leg 45 of the manometer tube communicates alsowith this chamber. vThe I leg 43 has an almost horizontal portion 46, the purpose of which will later be explained. The lower portion of the manometer tube is filled with a liquid 41 such as mercury or any other suitable liquid. Within the leg 45 are contact elements 48,'49 and 50 which are connected by wires 5|, 52 and 53 with posts 54, 55 and 56. Leg 45 has a restriction 66.

The posts 54, 55 and 56 may be connected with suitable electrical circuits not shown which will be controlled as the contacts 48 and 49 are closed by the column of liquid 41 or by closing of contacts 49 and 50 when the column of liquid has reached the contact 56. The column of liquid 41 will be moved by a differential pressure in chambers 3| and 32 as will presently be explained. A valve 51 is positioned in the pressure fluid supply line 34. This valve consists of a plunger 58 which is urged to close off the line 34 by means of a spring 59. The upper end of the valve engages the lower side 60 of the guide I3. When in the position shown in Figure l the upper endn of the valve resting on the lower side 68 will hold the valve open so that fluid under pressure When the guide I3 may ow through the line 34. is retracted the plunger may slide up on the cam surface 6| so that the end of the plunger will be in dotted line position 62 and the pipe 34 will be closed. This provides for cutting off pressure fiuid whenever the device is withdrawn from the work.

In operation fluid from the source of supply from line 34 will be reduced in pressure through valves 35 and 36 and delivered to chamber 32. In this chamber fluid will be maintained at substantially constant pressure. Fluid connection 4| will supply pressure fluid to the top of the mercury column 41 in leg 43 so that the pressure on the mercury in this leg will be substantially the same pressure as exists in the chamber 32. If nipples 28 and 29 were closed so that a static pressure existed in chamber 3| then the same pressure would be maintained through the lines 40 and 42 to the top of the mercury column in the leg 45 of the manometer tube. In operation, however, uid will escape through the space between nozzle 23 a'nd the surface of the work 26. This will give a reduced pressure in the nipples 28 and 29 and consequently a reduced pressure in the chamber 3|. Further reduction in pressure in chamber 3| will be created by the Venturi action of the fluid issuing through the restrictions in the plugs 31 and 38. The pressure in the tubes 21 will determine the Velocity of the fluid through the restrictions and consequently will determine the pressure in the chamber 3|. 'Of course the pressure in the chamber 3| will determine the pressure above the body of liquid in the leg 45. 'I'he nozzles 24 will be adjusted with respect to the surface of the work at the beginning of a machine or grinding operation and will remain in this fixed predetermined position relative to the work during the entire grinding operation. As the work is reduced in size fluid will be permitted to flow more freely through the noz- .zles 24 and consequently the pressure will be gradually reduced in the nipples 28 and 29. The reduction will be multiplied in the chamber 3| due to the increased ,velocity of the fluid through the restrictions in the plugs 31 and 38 so that a slight variation in the size of the work will be As pressure is reduced on the liquid in the leg 45 the liquid in this leg will rise until contacts 48 and 49 are closed. The. device will be so set that when these are closed any suitable mechanism on the grinding or other machine may be 5 controlled, such as slowing down the feed of the grinding wheel or any other operations which should be put in action or which should be stopped at this time. When the work has been further reduced in size so that the pressure in 10 lines 28 and 29 is further reduced a still greater pressure differential will be created between the legs 43 and 45 so that the liquid in the leg 45 will rise further and close contacts 49 and 58. These contacts will be closed when the work 15 has been reduced to its final or finished size. Suitable mechanism may be set into motion for stopping operation of the grinding or other machine at this time. The means by which various operations of the machine will be controlled by 20 closing contacts 48, 49 and58 are more fully disclosed in my copending application Ser. No. 598,498, filed March 12, 1932.

The work is shown as having ar key way 61. By reason of the restriction 66 this key way will 25 not cause uctuations in the column of liquid.

In the modified form shown in Figure 8 a single fiuid line 63 is connected to the block 64 and this line separates into two tubes 65 and 66 which are connected to the fluid nozzles on the oppo- 30 site sides of thework.'

Due to the fact that the leg 43 has a relatively longitudinal portion 46, when the column of fluid in leg 43 has been lowered to the position indicated by the line :r-y the surface area of the 35 column of liquid will be considerably increased. This further increases the rise of liquid in the leg 45 and decreases the fall in the leg A43 and will tend to move the column of liquid in the leg 45 to a greater elevation. This provides a 0 further magnifying of the pressure differential in the chambers 3| and 32.

It willbe obvious to those skilled in the art that various changes may be made in my device without departing from the spirit of the inven- 45,

tion and therefore I do not limit myself to what is shown in the drawings and described in the specification, but only as indicated by the appended claims.

Having thus fully described my said invention, 50 what I claim as new and desire to secure by Letters Patent, is:

1. In a machine for reducing the size of work, the combination of a pair of nozzles positioned approximately at opposite sides of the work, a 55 source of pressure uid in communication with said nozzles, and means for registering variation in pressure of said fiuid due to escape of fluid as the work is reduced in size, substantially as set forth.

2. In a machine for reducing the size of work, the combination of a`pair of uid nozzles positioned approximately at opposite sides of the work, said nozzles being in communication with a source of fiuid under pressure, the fluid being per- 05 mitted to escape between the nozzles and the surface of the work, and means controlled by variation in the pressure fluid due to variation in the space between the work and the nozzles in control of means for varying the size of the work, 70 substantially as set forth.

3. 'I'he combination with a pressure gage of a plurality of iiuid nozzles, said nozzles being positioned with their outlets adjacent the surface of work to be gaged, a source of fluid under pressure 75 in communication with said nozzles, variation in the size of the work creating a variationin the rate of flow of fluid through the nozzles, a manometer comprising a U -tube having each leg partially filled with liquid, the liquid in one leg being under a constant pressure and the liquid in the other leg being subject to lvarying pressures due to variation in the flow of the fluid through the nozzles, and means for multiplying variation in pressure of said fluid to multiply the result in the manometer tube, substantially as set forth.

4. A gaging device of the kind described comprising a source of fluid under pressure, means for permitting said fluid to escape adjacent the surface of work to be gaged, the rate of escape of said fluid being directly proportional to variation in the size of the work, and means controlled by the rate of escape of said fluid for controlling means for causing the variation in the size of the work and means for compensating irregularities in the shape of the work to prevent such irregularities from interfering with accurate gaging of the size of the work, substantially as set forth.

5. In a machine for reducing the size of work, the combination of a pair of fluid nozzles in communication with a supply of uid under pressure, a block having a pair of chambers therein, a source of duid under high pressure in communication with one of said chambers, the uid nozzles being in communication with the other of said chambers, restricted passages between the chambers for increasing the velocity flow of fluid from one chamber to the other, said passages being disposed respectively relative to the iluid nozzles to said chamber so as to create a suction in the chamber to which said nozzles are connected, said suction being varied in response to variation in the speed with which fluid issues from the said nozzles due to a reduction in the size of the work, substantially as set forth.

6. In a gaging device of the kind described, a fluid nozzle having a hemi-spherical outer wall and a radial port therethrough, the outer wall serving to direct air currents inw the path of an issuing jet to prevent breaking down of lthe jet until it has traveled a relatively great distance from the nozzle outlet, substantially as set forth.

7. In a gaging device of the kind described a manometer tube having two legs, a body of liquid in said tube and positioned so as to partially illl each leg, one of said legs having a bent portion adapted to extend approximately in a horizontal direction, a source of varying fluid pressure in communication with one of said legs, and a body of fluid under constant pressure in communication with the other of said legs. the fluid under constant pressure causing at times liquid to be moved until its surface lies within a horizontal plane passing through the horizontal portion of the leg, whereby a given increment of increase in pressure on this leg will lift the column of liquid in the other leg to a greater'height, substantially as set forth.

8. In a gaging device of the kind described a manometer tube having two legs, a body of liquid in said tube and positioned so as to partially fill each leg, one of said legs having a bent portion adapted to extend approximately in a horizontal direction, a source of varying fluid pressure in communication with one of said legs, and a body of fluid under constant pressure in communication with the other of said legs, the fluid under constant pressure causing at times liquid to be moved until its surface lies within a horizontal plane the connections of passing through the horizontal portion of the leg, whereby a given increment of increase in pressure on this leg willlift the column of liquid in the other leg to a greater height, and means for changing the pressure differential on the liquid 5 in the two legs in response to variation in the size of work being gaged, substantially as set forth.

9. In a machine for reducing the diameter of cylindrical work, a' gage for said work comprising a pair of nozzles through which fluid under pressure is caused to escape, said nozzles being posi- .tioned adjacent the surface of the work and spaced from each other circumferentially of the work whereby variation in thesize of the work causes a variation in the escape of the fluidi;

through said nozzles, and means controlled by variation in the freedom with which fluid issues from said nozzles' in control of certain operations'of said machine, substantially as set forth.

10. A device to control chine from the size of the work piece comprisingv one or more nozzles positioned adjacent said work piece and adapted to direct a. stream of 'fluid thereagainst, agage responsive to changes in the rate of flow of fluid against the workas the Work 25 changes in size, and means to make said gage uniformly sensitive overa predetennined range corresponding to a given change in size of the work piece, substantially as set forth.

11. In a machine vfor changing the size of ajo work piece, a device actuated by said change in size and adapted to control the operation oi' the machine comprising one or more nozzles positioned adjacent said work piece and adapted to direct a stream of fluid thereagainst, a gage responsive to change in velocity of the fluidas the size of the work piece changes, and means to make said gage uniformly sensitive over a predetermined range corresponding to a given change in size of the work piece by stream lining said nozzles, substantially as set forth.

12. A device to control the operation of a machine from the size of the work piece comprising one or more nozzles positioned adjacent said work piece and adapted to direct a stream of fluid thereagainst, a gage responsive to changes in the rate of flow of fluid against the work as the work changes in size, means to make said gage uniformly sensitive over a predetermined range corresponding to a given change in size of the work 50 piece, and additional means to further control the sensitivity of said gage, substantially as sety forth.

13. In a grinding machine, a work sizing device comprising a nozzle having a body of fluid in communication therewith to issue therethrough, said nozzle being positioned during operation adjacent the surface of work to be gauged, the rate of escape of the fluid being determined by the distance between the nozzle and the surface of the work, the outer contour of the nozzle being stream-lined whereby the issuing jet of fluid will entrain a cone oi' lluid about the outside of the nozzle to assist in holding together the issuing jet of fluid as the space between the nozzle-and the work increases.

I4. A device of the kind described comprising a nozzle having a body of fluid in communication therewith to issue therethrough said nozzle being positioned so as to make said fluid responsive to a change in size of a work piece during machining, the outer contour of the nozzle being'streamlined whereby the issuing jet of `fluid 'will entrain a body of fluid about the outside of the nozzle to assist in holding together the issuing jet of fluid.

the operation oi' a ma- 20 echange wat, .the restricted passage theraetionoi thergrzinxling. rnachine.'I ,il Aiigaging:devicentoma1grindingagmachine t com risingauid conduit;.a.:.nozzle tor-z siluidfthereiromrga support for 1 thernozzle f gmvebleftowardandfroxnithe-work forgetting and- ;saidnozzle ma predetermined fixedv vmi' centro inglfth'e iluiditbererromi'fmeansfioriiholdinglfsaidi" determined position' relative Spensertofachangeglinsthe-ilow orfnuidfi'rom the nozzlemzand. l controllati .-'by the fstvelocity; io .controlling Doeitie geistiger@ the work.- whereby, ilow from v thelffngszle is:- controlled by ythe work and ta increase asythegsizei voi the-.woik de-- Caused'.

creasesr ldneosduit havingarestrlcted p forensischesselecitrchanse ,intnenew of fluidl ,said veloeityehaneegvsryingin respcnserto ,Al-,restricted psssaceror controlling the aetienf the i.

-- l z. ing the tluidtherefrom,

.changeinthesizeofthe fixe? l fiowrrom the nozzle is controlled by the work and caused toincreaseas the size- Lof thework de- ;igreesessleid conduit. havinsarestrieted passage avelocltv, chsnsein the .new .0f eloeity, change verving in response the flow. or ihiid'afrcm .the nozzle.

y-the yvelocity ,chelles et the e grinding machine, and means-whereby the flower fluid iremsthe riezzlafiseut .efiwhen vsind Suppen is retracted slldfllbi? when ,Qmilvedteseid setposition l v v l eine device fer a.:irrinslins machine, comprisinsferiluideenduit. ,Qfnoazles .eens nested-tassiseendmt fos-disehrsihs Lfluid therefrom-.fmeansfiersilnwrfins-seld rwzzlesinexed position .l relative tortheigork Operated uren and et mintsspeesdfeireumierenilslly @erect where-v byy theflowoi2uid rinforzi,4 each :nozzleis conf,

trol.. @byfihelvorkandis,eesedteinereseasthe, brsnchss-leeelngtofthe respective agiles associated 1theenMameli-.sudrevisingare-y Strifeisd 'efiasxnredueins:elvlvsltnehenseo uidintoftheresneetive branches nscontgrildiby mereces 9 asesina devierfprr. e

`nd rat points spaced circumierentially thereoif..

wherebyl the new; of afiuidffrom' ficelle 1S cfm-1 trailed ,by the work midis ,Ceusedftcinerseees sizel of the work decreases.y saii conduit having Y, y

branches. laminato the respective nezzlesf .means 'asseeiated wtheach branch anderer/laine. a ref stricted passage for; producing e, vele-.city change in thefnow; or;auidnrtdtnelrespetive a restricted e on the movable body ins tbesetion ciy tissus established similareatI Strietedtvasssesarf conm-111ml. the-H99 f grinding restricted passages for controlling the action o! the grinding machine, said means for supporting the nozzles being movable toward and from the work, and means controlled thereby for cutting l on the iiuid supply from the nozzles when said support is retracted and ior automatically establishing said flow of iluid from the nozzles when the nozzles are moved to a set position relative to e work. A 10 20. A gaging device for a grinding machine comprising a fluid conduit, a nozzle for discharging the iluid therefrom. means responsive to a change in the size of the work for varying the flow oi nuid from the nozzle. said conduit having 1s a restricted passage i'or producing a velocity change in the ilow of the iluid in the conduit, a tube having a movable body therein, means connecting one end oi' said tube with said conduit between the restricted passage and the source of l) supply, and means for connecting the other end o! the tube with the conduit adjacent the restricted e so that the change in the velocity of the flow o! the iluid produces a differential pressure on the movable body within the tube. I 2l. A gaging device for a grinding machine comprising a iluld conduit, a nozzle ior'dischargmeans responsive to a work for varying the ilow of i'iuid from the nozzle, said conduit having I for producing a velocity change in the ilow of the iluid in the conduit, a

. if tube having a movable body therein, means conlve te-the work-whereby the;

necting one end of said tube with said conduit between the restricted passage and the source of l supply. 4means for connecting the other end of the tube with the conduit adjacent the restricted passage so that the change in the velocity oi' the ilow of the iluid produces a dii'ierential pressure within the tube, electric d0 contacts within said tube and spaced from each other, said body within the tube being of conductive material, and means controlled by the contacts for controlling the action of the grinding machine dl -22. A gaging device for a grinding machine comprising a fluid conduit, a. nozzle for discharging the iluid therefrom, means responsive to a change in the size of the work for varying the flow of nuid from-the nozzle. said conduit having l0 a restricted passage for producing a velocity change in the flow of the fluid in the conduit. a tube having a movable body therein, means consize of the work decreases, said conduit having nectms one end 0f said tube with md conduit between the restricted passage and the source of Il supply, means for connecting the other end of the tube with the conduit adiacent the restricted passage so that the change in the velocity of the now of the fluid produces a diierential pressure on the movable body within the tube, said tube having a section thereof shaped so as to provide an approximately horizontal portion disposed so that the surface of the movable body in the tube subjected to the pressure i'rom the conduit moving said body lies within said horizontal section. whereby the volume of liquid moved for a. given increment of change in the diierential pressure is increased.

23. A gaging device for a grinding machine n comprising a fluid conduit, a nozzle for discharging the uid therefrom, means responsive to a change in the size of the work for varying the flow of fluid from the nozzle, said conduit having a restricted passage for producing a. velocity change u in the ow of the fluid in the conduit, a tube having a movable body therein, means connecting one end of said tube with said conduit between the restricted passage and the source of supply, means for connecting the other end of the tube with the conduit adjacent the restricted passage so that the change in the velocity of the ow of the fluid produces a diiferential pressure on the movable body within the tube, electric contacts within said tube and spaced from each other, `said body within the tube being of conductive material, and means controlled by the contacts for controlling the action of the grinding machine, said tube having a section thereof shaped so` as to provide an approximately horizontal portion disposed so that the surface of the movable body in the tube subjected to the pressure frothe conduit moving said body lies within said horizontal section, whereby the volume of liquid moved for a given increment of change in the differential pressure is increased.'

24. A gaging device for a grinding machine comprising a fluid conduit, a nozzle for discharging the iiuid therefrom, said iiuid conduit havingv spaced chambers, one of which is connected to the fluid supply and the other of which is connected to said nozzle, a restricted fluid passage connecting said chambers and disposed so that a' change in the velocity of the iiow of fluid through the passage produces a variation in the pressure in-the chamber connected to the nozzle, means whereby the ow of iiuid from the nozzle is caused to change as the size of the work varies, a tube having a movable liquid body therein, one end of said tube being connected to one of said chambers and the other end of said tube being connected to the other cmrnber.

25. .A gagng device for a grinding machine comprising-a fluid conduit, a pair of nozzles for discharging the fluid from the conduit, said fluid conduit having spaced chambers, one of which is connected to the source of supply and the other of which is connected to said nozzles, means forming a restricted passage between the chambers, said restricted passage being disposed in alinement with the passages leading to the nozzles, a tube having a movable liquid body therein, one end of said tube being connected to one of said chambers and the other end of said tube being connected to the other chamber, and electric contacts within said tube spaced from each other and disposed so that the diirerential pressure created on said liquid will shift the same and cause a circuit to be established through said electric contacts, said contacts being adapted to control the action of the grinding machine.

26. A gaging device for grinding machines -the ow of iiuid comprising a fluid conduit, a pair of nozzles for discharging the fluid therefrom, means for supporting' said nozzles, said means being movable so as to position and maintain said nozzles in a xed set position from the nozzles is Vcontrolled by the work and increases as the work diminishes in size, said conduit having spaced chambers, one of which is connected to the source of supply, nipples connected to the other chamber and to i0 the respective nozzles, said conduit having a restricted passage for producing a velocity change in the iiow of fluid from one chamber into the other and into the nipples, whereby the pressure on the chamber connected to the nozzles varies in response to the flow of fluid from the nozzles, a tube having a conductive liquid therein, one end of said tube being connected to one of said chambers and the other end of said tube being connected to the other chamber, and electric contacts disposed in said tube and spaced from each other whereby a differential pressure created on the iluid in the tube will establish circuits through said contacts and control the action of the grinding machine.

27. A gaging device comprising a iluid discharging the fluid therefrom, means for supso as to position fixed set position relative to the work whereby the ow of fluid from the nozzles is controlled by the work and increases as the work diminishes in size, said conduit having spaced chambers, one of which is connected to the source of supply, nipples connected to the other chamber and to the respective nozzles, said conduit having a restricted passage for producing a velocity change in the ow of iluid from one chamber into the other and into the nipples whereby the pressure on the chamber connected to the nozzles varies in response to the iiow of fluid from the nozzles, a tube having a conductive liquid therein, one end of said tube being connected to one of said chambers and the other end of said tube being connected to the other chamber, electric contacts disposed in said tube and spaced from each other whereby a diilerential pressure created on the iiuid in the tube will establish circuits through said contacts and control the action of the grinding machine, and means whereby the iiuid supply to the nozzles is cut oii when said support is retracted and is automatically established when the support is moved to place the nozzles in a predetermined set position relative to the work.

HAROLD E. BALSIGER.

relative to the work whereby Y 5 

